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參數資料
| 型號： | ADV7125KST140 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | CMOS, 330 MHz Triple 8-Bit High Speed Video DAC |
| 中文描述： | PARALLEL, 8 BITS INPUT LOADING, 8-BIT DAC, PQFP48 |
| 封裝： | 1.40 MM, PLASTIC, MS-026BBC, LQFP-48 |
| 文件頁數： | 9/12頁 |
| 文件大小： | 264K |
| 代理商： | ADV7125KST140 |
REV. 0
ADV7125
–9–
CIRCUIT DESCRIPTION AND OPERATION
The ADV7125 contains three 8-bit DACs, with three input
channels, each containing an 8-bit register. Also integrated on
board the part is a reference amplifier. CRT control functions
BLANK
and
SYNC
are integrated on board the ADV7125.
Digital Inputs
Twenty-four bits of pixel data (color information) R0–R7, G0–G7,
and B0–B7 are latched into the device on the rising edge of
each clock cycle. This data is presented to the three 8-bit DACs
and then converted to three analog (RGB) output waveforms
(See Figure 2).
CLOCK
DATA
ANALOG OUTPUTS
(IOR, IOR, IOB
IOR
,
IOG
,
IOB
)
DIGITAL INPUTS
(R7–R0, G7–G0, B7–B0,
SYNC
,
BLANK
)
Figure 2. Video Data Input/Output
The ADV7125 has two additional control signals that are latched
to the analog video outputs in a similar fashion.
BLANK
and
SYNC
are each latched on the rising edge of CLOCK to maintain
synchronization with the pixel data stream.
The
BLANK
and
SYNC
functions allow for the encoding of
these video synchronization signals onto the RGB video output.
This is done by adding appropriately weighted current sources
to the analog outputs, as determined by the logic levels on the
BLANK
and
SYNC
digital inputs. Figure 3 shows the analog
output, RGB video waveform of the ADV7125. The influence of
SYNC
and
BLANK
on the analog video waveform is illustrated.
Table I details the resultant effect on the analog outputs of
BLANK
and
SYNC
.
All these digital inputs are specified to accept TTL logic levels.
Clock Input
The CLOCK input of the ADV7125 is typically the pixel clock
rate of the system. It is also known as the dot rate. The dot rate,
and thus the required CLOCK frequency, will be determined by
the on-screen resolution, according to the following equation:
Dot Rate
= (
Horiz Res
)
×
(
Vert Res
)
×
(
Refresh Rate
)/(
Retrace Factor
)
Horiz Res
= Number of Pixels/Line
Vert Res
= Number of Lines/Frame
Refresh Rate
= Horizontal Scan Rate. This is the rate at which
the screen must be refreshed, typically 60 Hz for a noninterlaced
system or 30 Hz for an interlaced system.
Retrace Factor
= Total Blank Time Factor. This takes into account
that the display is blanked for a certain fraction of the total
duration of each frame (e.g., 0.8).
RED, BLUE
GREEN
mA
V
mA
V
18.62
0.7
26.67
1.000
0
0
8.62
0.3
0
0
WHITE LEVEL
BLANK
LEVEL
SYNC
LEVEL
100 IRE
43 IRE
NOTES
1. OUTPUTS CONNECTED TO A DOUBLY TERMINATED 75 LOAD.
2. V
= 1.235V, R
= 530 .
3. RS-343A LEVELS AND TOLERANCES ASSUMED ON ALL LEVELS.
Figure 3. RGB Video Output Waveform
Table I. Video Output Truth Table (R
SET
= 530
, R
LOAD
= 37.5
)
Description
IOG (mA)
IOG
(mA)
IOR/IOB
IOR
/
IOB
SYNC
BLANK
DAC Input Data
WHITE LEVEL
VIDEO
VIDEO to
BLANK
BLACK LEVEL
BLACK to
BLANK
BLANK
LEVEL
SYNC
LEVEL
26.67
Video + 8.05
Video
8.05
0
8.05
0
0
18.62 – Video
18.62 – Video
18.62
18.62
18.62
18.62
18.62
Video
Video
0
0
0
0
0
18.62 – Video
18.62 – Video
18.62
18.62
18.62
18.62
1
1
0
1
0
1
0
1
1
1
1
1
0
0
FFH
Data
Data
00H
00H
xxH
xxH
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| ADV7125KST50 | 制造商:Analog Devices 功能描述:DAC 3-CH Segment 8-bit 48-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:8-BITTRIPLE HS VIDEO DAC (50-330MHZ)I.C. - Bulk 制造商:Analog Devices 功能描述:IC 8-BIT VIDEO DAC |
| ADV7125KSTZ140 | 功能描述:IC DAC VIDEO 3-CH 140MHZ 48LQFP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 數模轉換器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 設置時間:4µs 位數:12 數據接口:串行 轉換器數目:2 電壓電源:單電源 功率耗散（最大）:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-uMAX 包裝:管件 輸出數目和類型:2 電壓，單極 采樣率（每秒）:* 產品目錄頁面:1398 (CN2011-ZH PDF) |
| ADV7125KSTZ140 | 制造商:Analog Devices 功能描述:D/A Converter (D-A) IC |
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| ADV7125KSTZ50 | 制造商:Analog Devices 功能描述:D/A Converter (D-A) IC |
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